[DMC #5.55] Add DocumentMarkerList::MarkerType()

third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h

Index: third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
diff --git a/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
index ff3de05d1391139db2c952726c3d1a0c40daf3cb..def3f14199fc6dd88a144fb3e4d3245fbfc2ac4e 100644
--- a/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
+++ b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
@@ -9,13 +9,13 @@
 
 namespace blink {
 
-// Implementation of DocumentMarkerList for Spelling/Grammar markers.
-// Markers with touching endpoints are merged on insert. Markers are kept sorted
-// by start offset in order to be able to do this efficiently.
+// Nearly-complete implementation of DocumentMarkerList for Spelling or Grammar
+// markers (subclassed by SpellingMarkerListImpl and GrammarMarkerListImpl to
+// implement the MarkerType() method). Markers with touching endpoints are
+// merged on insert. Markers are kept sorted by start offset in order to be able
+// to do this efficiently.
 class CORE_EXPORT SpellCheckMarkerListImpl : public DocumentMarkerList {
  public:
-  SpellCheckMarkerListImpl() = default;
-
   // DocumentMarkerList implementations
   bool IsEmpty() const final;
 
@@ -34,6 +34,9 @@ class CORE_EXPORT SpellCheckMarkerListImpl : public DocumentMarkerList {
 
   DECLARE_VIRTUAL_TRACE();
 
+ protected:
+  SpellCheckMarkerListImpl() = default;
+
  private:
   HeapVector<Member<RenderedDocumentMarker>> markers_;